Sudan People's Liberation Movement-in-Opposition

The Sudan People's Liberation Movement-in-Opposition (SPLM-IO) is a mainly-Nuer faction of the Sudan People's Liberation Movement in South Sudan, formed in 2013 by Riek Machar in opposition to Salva Kiir's faction. The party and its militia fought against the SPLM and Sudan People's Liberation Army in the South Sudanese Civil War after December 2013, and the SPLM-IO fought against the mostly-Dinka forces of Kiir.